123318920 has 32 divisors (see below), whose sum is σ = 279016920. Its totient is φ = 49052160.

The previous prime is 123318917. The next prime is 123318931. The reversal of 123318920 is 29813321.

It can be written as a sum of positive squares in 4 ways, for example, as 41705764 + 81613156 = 6458^2 + 9034^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1277 + ... + 15756.

Almost surely, 2^123318920 is an apocalyptic number.

123318920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123318920 is an abundant number, since it is smaller than the sum of its proper divisors (155698000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123318920 is a wasteful number, since it uses less digits than its factorization.

123318920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17225 (or 17221 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 123318920 is about 11104.9052224681. The cubic root of 123318920 is about 497.7484361396.

The spelling of 123318920 in words is "one hundred twenty-three million, three hundred eighteen thousand, nine hundred twenty".